21.Or just a cake topper.

22.Treat your guests to a Honeydukes-inspired candy bar.

https://www.instagram.com/p/BMz73vBDsdC/

https://www.instagram.com/p/BMgpPXth615/?tagged=honeydukes

This one is so easy to DIY. Get some big glass jars like these and download and print some labels to make them look genuine. This site also has directions on making chocolate frog and Bertie Bott's boxes.

23.If you're thinking of having a photobooth for guests, invest in some props for awesome photos.